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Infinity's PS38 doesn't just play low and loud, it produces the kind of clear, accurate bass that makes movies and music seem more real. It's all thanks the combination of Metal Matrix Diaphragm® driver technology and a low-resonance enclosure. They ensure that this subwoofer  driven by the built-in 150 watt amplifier  can rock out without introducing any audible distortion. Your music will thrill with low-end punch and your movies will have that extra rumble that makes you feel like you're part of the action.

Infinity's exclusive Metal Matrix Diaphragm driver
The Primus PS38 features Infinity's exclusive Metal Matrix Diaphragm ("MMD" for short) driver technology in the 8" front-firing woofer. It consists of a stiff aluminum core, anodized on both sides for increased strength and rigidity. The result is extremely fast, extremely accurate response, giving you distinctly cleaner, more realistic bass, even at higher volume levels.

Build a complete Primus® system
The Infinity Primus PS38 will fill most rooms with dramatic and well-defined bass. Connect it to your receiver using either the LFE or line-level inputs. Easily accessible controls on the back of the sub help you blend it in with the rest of your system. The Primus PS38 is voice-matched with the entire Primus home theater speaker lineup, so you can create a high-quality sound system that meets your needs.

Why add a powered subwoofer?

A powered subwoofer gives you bass you can feel as well as hear. Our customers love the depth and impact their subs add to music and movies. We hear comments like "it brings out sounds I didn't know existed in discs I've watched a million times." Powered subwoofers aren't just for big bass that rattles your picture frames; they can also deliver tight, accurate lows. If you haven't shopped for a powered sub in a while, you might be surprised at how small they get. Look for an ultra-compact model if you want to tuck your sub away under an end table or in a corner.

Product Research

Features

Metal Matrix Diaphragm
(M.M.D.):
Derived from the C.M.M.D. material used in Infinity's flagship Cascade series, M.M.D. features a stiff aluminum core, anodized on both sides for increased
strength and rigidity. M.M.D. transducers conduct sound faster than paper,
polypropylene, and Kevlar, pushing unwanted resonances beyond the operating
range of the transducer. M.M.D. drivers deliver crystal-clear, distortion-free
sound from dynamic digital sources, even at high listening levels. The PS38 is
equipped with a front-firing, 8" M.M.D. woofer.

Amplifier: This subwoofer is powered by a 150-watt (RMS) amplifier,
rated at 35Hz - 150Hz with no more than 0.1% THD. The maximum (peak) power
output is 300 watts.

Surround: For a smoother
response and improved durability, the woofer uses a rubber surround.

Bass Ports: There
are two rear-firing bass ports that allow deep bass with high acoustic
efficiency and low distortion.

Controls

Gain Control:
The subwoofer has a
rotary control on the rear panel for adjusting the level of the bass.

Low-Pass Crossover: The
subwoofer features a continuously variable 50Hz-150Hz low-pass crossover that
determines the highest frequency at which the subwoofer reproduces sounds. The
crossover has a 24dB/octave slope.

Note: The crossover is bypassed when
the "LFE" input is used.

Phase Switch:
The subwoofer's phase
switch allows you to control the phase of the subwoofer's output relative to the
front speakers. If the bass sounds muddy or unclear, toggling the phase control
can sometimes strengthen the bass "attack."

Auto On/Off Circuit: The auto on/off circuit turns the power amp on when a signal is sensed and
turns the amplifier off and into standby mode approximately 10 minutes after a
signal is no longer received. An LED indicator on the rear panel glows green
when the amplifier is on and red when the amp is in standby.

Connections

Line-level
Inputs: The subwoofer
has a gold-plated LFE input (single RCA) and gold-plated stereo RCA inputs. If you have a
Dolby Digital/DTS receiver or processor with a low-frequency-effects (LFE)
output, you should use the LFE input on the subwoofer. If your
receiver/processor does not contain a Dolby Digital or DTS processor but has a
subwoofer output, you must use the stereo RCA inputs. If the receiver/processor
has a mono subwoofer output, a "Y" adapter is recommended to maximize
performance.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to
find elsewhere. That's because we have our own in-house Product Research
team. They verify what’s in the box, check the owner's manual, and record
dimensions, features and specs. We stay on top of new products and technologies
to help people make informed choices.

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Incredible Quality

Beautiful to look at as well as listen to. Added this to my Polk TSX floor standing speakers and it brought just the right amount of low to ultra low bass I was looking for. A perfect match for my system.

Perfect Replacement Subwoofer

This Subwoofer is perfect in every way. Priced right and works excellent. Super easy to hookup and small enough not to be sticking out and obvious. The sound is exactly what I needed in a replacement to the JBL that failed. Had in just in time for the start of NASCAR and what a sound when "Crank It Up" comes on. Definitely recommend.

Love Infinity

Always liked Infinity speakers. Bought this to replace a 10+ year old Infinity Sub Woofer. Sounds as good as the old one did before it died. This was also a scratch and dent unit, but except for the beat up box, I couldn't find a scratch or a dent on it.

Great Woofer

I had missed the great audio days of the 70's. Recently I purchased a Yamaha RX-V477. I wanted to get speakers that would compliment that unit. The Infinity Primus P363 tower speakers, P153 bookshelf speakers, PC251 center speaker, and PS38 woofer are great. My music sounds great. Watched a movie with the family and felt like I was in the theater. Great speakers.

Pros:Sound reproduction is very good. Enclosures allow the sound to be natural.

Infinity PS 38 Subwoofer

I have an audio system with 4 Mirage bookshelf speakers and a Yamaha receiver. I was looking for a subwoofer to help round out the bottom. I'm not interested in rattling the windows; I just wanted a sub to fill in the low end and take some of the load off the bookshelf speakers. The PS 38 does exactly what I want. My system sounds more natural and more alive.

Exceeds Expectations!

I have installed this gem on a system in a basement that is utilized on channel A for surround sound, and channel B for music with floor standing speakers. In both cases, the subwoofer out performed what I had expected. Being in my late 20's, I still remember the bass I had in my SUV when I was 16 from a pair of 12's. This sub comes the closest to jogging those memories out of the three (3) I have most recently heard at a local box store. If you are searching for an occasional rumble during a movie, or rehashing the rumble of a 90's rap song, for the price, this won't let you down.

Infinity Primus PS38 Subwoofer

Powerful little sub. I bought this for a second sound system I have in a 2nd music room ( to really get a way from it all) and have it paired with Infinity P153 Speakers. Hooked up to a Yamaha RS700 stereo receiver a cd and turntable. I could not be more happier with this sub. In this price range you'll never beat it. I hope if you are reading this review you have dealt with Crutchfield , they are the absolute best. I seriously don't shop anywhere else. This Sub was highly recommended by an advisor there.

Pros:Its small enough that you can place it anywhere but has a big sound

Honestly can't imagine anyone needing more

Your system is only as good as it's weakest link. This sub WILL NOT be the weak link in any setup unless you are trying to have concerts in a gymnasium, even then it might hold its own. Tight, clear, clean, and unbelievable bass. It is unfortunate that floor speaker technology can't keep up with powered sub tech, I wouldn't have to have these giant 25 yr old Polk's.

Pros:It can be whatever you want. Cover the low end that your main channel can't, or rattle dishes in your neighbors house.

Super Sub

I bought the PS38 to pair with my Infinity P153 speakers. I have it connected into an Onkyo TX-8050 receiver. My room setup is 12'x14' and I placed the sub next to a dresser and a chair. This is the only room I have for it, so I couldn't tell you how it would sound elsewhere. The speakers are near it. The left is on the opposite side of the dresser, or about 5' away and the right is about 2' overhead (and over a few inches).

The bass compliments the overall sound of the system. It's a clean and sounds amazing. It's makes listening to music and movies so much better. It's not overpowering and doesn't drown out the other sounds. I've had the sub now for a few days. My crossover setting is 80 (which is the white dot at the "11 o'clock position") and my gain is 1/2 way or at the "12 o'clock position". I will probably readjust the settings after the break-in period.

I love this subwoofer and need to credit the folks at Crutchfield for the recommendation. I was researching a subwoofer and am so glad I went with this one. If you're looking for a "smaller" sub to go with your sound system, I would recommend this one. Also, one feature that I love is the subwoofer automatically turns off after a few minutes of no activity. Great feature.

If you're looking to add bass to a home theater in a living room or larger bedroom etc. then you might need to look at a larger subwoofer.

Pros: Clean bass
Rounds out sound system
Adds more realistic sound in movies
Looks amazing
Auto turn-off if you're not using it.

Beyond happy with the Infinity Primus PS38

Love this unit. Added everything and more to my pair of bookshelf speakers. Found the perfect blend almost immediately by reading the easy to understand instruction manual. Highly recommend.

PS: and only to me, don't skimp by buying or using cheap cables. Your system will only sound as good as your weakest cable. Enjoy enjoy the sound your system has to offer. Just my opinionated 2 cents to help you enjoy your speaker/speakers. Crutchfield's website offers up some good tips on speaker placement too.

Pros:Great price, great sound.

Cons:Sub woofers am guessing by nature can be rather large compared to bookshelf speakers, or to me. Just check the dimensions before you order on to insure you have a place for it.

Nice woofer

This is the first sub that I've bought. Just getting into the home surround scene after redoing my den. Wow...what a difference. Music sounds great. You can make the whole house move if you want. Movies are awesome, you can really feel the all the action. Xbox sounds really cool (when the wife's not home) sounds like a war zone! Just buy it you won't be disappointed , unless it's broken, then yes disappointment will follow.

Great Bass

I received the powered subwoofer within three days. The sound is clear and clean at all levels. I was very pleased with the additional base this product delivered. If I turn the volume on high, my windows rattle. So to keep peace in the neighborhood, I keep the volume down. The control knobs are with in easy reach as well as the on off switch. I would recommend this product.

After one month, pleased with PS38

Received in 3 days of order, plugged it in and was very pleased. The sub has clean, clear base you can feel but is not overpowering. Only listen to music (no surround set up) and the room is filled with sound like never before. Our large listening room and open floor plan may have paired better with a larger sub but for the price the PS38 is performing well. Bought to match with Infinity P163 bookshelf speakers. Overall pleased with both products. The P163s were very good without the sub but now they sound great. Should have bought this sub sooner.

Pros:Great base for the size and price and would recommend it.

Cons:Have to adjust the sub volume/gain for different discs and sources (between 45-65%). Would rather set it and forget it and this is why I only gave 4 stars.

Sweet sub!

Written By Eddie K., Sandown, NH on Monday, January 13, 2014

I bought this sub for a bedroom system and decided to try it out in my 24x24 family room with my large DCM loudspeakers and wow, was i surprised! I can't believe how much bass this sub produces for an 8 inch speaker. Highly recommend.

UPDATED 1/27/15: This is my second review on this product. I've had the pleasure of listening to this sub for both music and tv on a daily basis, for just over a year now and it just performs flawlessly. I still can't believe how clean and how much this sub produces.

Pros:Plenty of tight, clean bass.
UPDATED 1/27/15: Even after a year of daily use, still impresses.

Very Solid Sub

I added this sub to a larger than average living room with 10 ft ceilings. I have the room wired for surround sound, but am a music enthusiast at heart and really only interested in music listening for now. So at this point I just have 2 front speakers also in the mix (Episode) At first listen I was unsure that this sub was going to compliment the front speakers and the room. But after spending some time using the Audyssey function on my receiver - and then further manually tweaking the cross-over point by listening to bass heavy music (ultimately settling on 150 Hz )- the system got really dialed in and now sounds DYNAMITE. This sub is the perfect compliment to the range of the fronts. The room sounds extremely detailed and crisp and it's a joy to listen in (especially jazz). This sub has power to spare. Currently it's running at around 40% output. I'm confident that it will work well for Movie LFE applications. This sub is a great value.

Infinity Primus PS38

I'm currently running all my audio (turntable, TV, CD player, BluRay) through a Yamaha RX-V567 amp connected to Bose 301 speakers in front and Bose 201 speakers in the rear. In addition I have an Infinity Primus 351 center speaker. The room is approximately 30' wide by 18' deep. This sub fills the space beautifully. Just great, clear bottom for the system and room. Only question is, when is a remote-controlled sub going to come around? I like to change the sub's effects depending on what I'm watching on TV or listening to and tuning it manually isn't that big a hassle, but a remote? Awesome...

Primus PS38

For what I wanted this is the perfect fit. Way more quality than the sound bar/sub sytem that came with my TV, more adjustability and a simple hookup with one cable to my new Sony AV receiver. Very easy install, no more sub "popping" from the old one and I can vibrate the house if I want to. Likely I'll never turn the gain over half or so because with my wood floors and stucco walls the base can overwhelm the rest of the sound. I have a pair of older Bose 302's for "front" speakers and small bookshelfs wired together and plugged into receiver as a "center" channel. It's not ideal, but it's economical and as much sound as I need in my house. I think this sub could really power a nice home theater surround for all systems but the highest dollar or most discerning audiophile. Can't go wrong, especially if you score it on sale like I did.

I didnt believe

I really didn't believe how much difference a subwoofer would make to a surround system. Now I do. If you are looking for a sub to fill out your system, then get one. If not this one, which is awesome by the way, then another, but get one. Spend some time setting it up. Placement and sound levels are important. I run this one at about half and cant believe the difference in the sound in the room.

Nice little sub

This is a nice little sub that was the right price. Picked it up on sale for $199. Used in a 2.1 system with a Denon AVR-1913 HT Receiver and a pair of Infinity Primus P163 bookshelf speakers. Used primarily to compliment TV and movie viewing, the sub fills the room without shaking the walls. Was a great buy at $199.

Primus sub

Good sub , pairs nicely with my P-162's in a small , 12 by 20 room . They were good on their own but the sub adds a real depth to the music . Also use with a low end sound bar that needs to be upgraded . My next review will be my new soundbar and sub package . Never need to run at more than half volume , could easily overpower the listening stage in my set up .

Very nice

This Sub is very impressive. The price was great too. I replaced a much higher end sub with this Infinity PS38 and I must say I like this one better. You do need to turn the volume up on the sub when the receiver is at normal listening level but once you turn the receiver up you can reduce the sub volume to about 50 % and its perfect. For those of you wondering if it works well in a room with high ceilings, it does! My room is 20x18x22 and it sounds great.

Great subwoofer !!!

Great subwoofer and the price was right. Dylan suggested that I purchased this subwoofer to replace the one I had that went "belly up". He also suggested that I buy the open box subwoofer as the price was a little cheaper. Well he was right and right. Kudos to Dylan from guiding me in the right direction and I couldn't be more pleased. Just what the doctor ordered. Bass is right at about 50% volume; I could crank it up, but what's the point. Will continue to due business with Crutchfield in the future.

Primus sub

Delivers good bass, but must turn up to nearly 75% to get it to an appropriate volume. I have to say it performs significantly better than the Polk sub priced nearly the same. That sub was so poor I returned it. I have an 8" Definitive sub that is MUCH more powerful and clearer than this sub, but it did cost twice as much. For the price, I feel the Infinity it is a good buy. I use it just to fill in the gap missing from a pair of small bookshelf speakers when working out, but gave an older one to my parents for their home theater and it works well.

Outstanding Sub for the money!

I own 4 powered subs-the newest which the PS 38. The one to which I compare the performance of all of them is my 16 year old Cambridge Soundworks PSW-1, a 12 inch acoustic suspension powerhouse which is twice as big and cost 3x as much as the PS 38. I must say the PS 38 holds its own very well to the larger one with clear and deep bass in a 20 x 20 foot cathedral ceiling home theater room. I didn't think the PS 38 wouldn't even come close to the CSW PSW-1, but, amazingly, it does. I used the Audyssey feature on my ONKYO receiver which I also bought from Crutchfield to reset my satellite speakers with the PS 38. I was skeptical at first but Nick was right, the PS 38 is an amazing little subwoofer for the money, especially if you can get it on sale as I did. Eventually, I'll probably bring back my CSW PSW-1 into the room which I use with a SUPERCUBE III, (I think the PS 38 is as good or better), but for right now, I am still mightily impressed with the performance of the INFINITY PS 38 on all program material including CD's, DVD's, and HDTV. I can't imagine a better subwoofer for the money. Hopefully, it will also last for 16 years.

Very Nice Sub

Very nice sub for the money. It really puts out plenty of bass for most people. I have to keep it around 60% power to keep the wife from complaining! In a 2000 sq ft house you can hear the bass clearly from the first floor through to the second. Not really a con, but it's a little larger than expected.

Precisely the subwoofer I was imagining

Web resources at hand, I read through my choices, the pricing, other reviews. I went with the Infinity Primus PS38 powered sub-woofer to supplement my heirloom hi-fi system (yes, bought back when stereo systems were referred to as Hi-Fidelity and there were dogs, references to 'his master's voice' and Gramophones lurking on LP labels). So, the woofer is powered from an auxiliary output on the old Yamaha CA-810 amplifier which is nested comfortably in a sea of cables, connections and switches so that I can accommodate my new BluRay disc player and a modern LED flat screen video screen (my amp back panel is fully filled). The fidelity specs for the woofer are absolutely fine for my (boomer) hearing range and for blowing out any unfortunately too nearby candles... This low end driver supplements my old sets of Tandberg Fasett (hexagonal, soccer-ball-sized) speakers which, at 4-ohms are wired in (paired) series and arranged as higher bookshelf L & R speakers... no 5.1, not yet. For my ears, the sound is amazing, subtle (I keep the SW volume toward the low end) and gives me exactly what the little Tandbergs cannot come up with. Highly, highly recommended and the Crutchfield techs are fantastic in getting you going on your way; many thanks there.

Lots of Boom for your Buck

I bought this gift for my husband to replace the Mirage subwoofer that came with our Denon Home Theater System. Because we already had the configuration setup it was unpack, plug in and enjoy. This subwoofer has a great throaty bass without being overpowering. I would highly recommend it. The Crutchfield crew got this to me in less than 24 hours. Thanks a lot guys!

Blends in Perfectly

Wonderful subwoofer, especially for the money. After some initial tweaking and a good suggestion from Crutchfield's tech.s, regarding my new Denon, which they really didn't have to do as I didn't purchase it there, which actually showed class on their part, my new subwoofer is everything I hoped for. I don't have to do much by way of crossover as my receiver does it for me, however, I did experiment with the volume and about halfway seems best. Placement is important as is phase and now my bass appears to be coming from every speaker as it should be. Both movies and music are equally enjoyable. Prior to becoming injured I was privileged to play bass guitar and although my equipment was vastly different it did give me an appreciation for good sound.

Pros:Sounds great without being overpowering and has just enough adjustment capability. Couldn't currently ask for better subwoofer for me.

Cons:None. The weight issue appears to be related to the fairly massive heatsink that is there to fix the problem Infinity had with an earlier subwoofer.

Best value for money of any sub on the market

I got the PS38 to replace my PS28, which died after 4 years of use. At first I was hesitant to go with Infinity again, but after shopping around I couldn't find any other subwoofer with the same frequency response, power or a warranty period that covered both the speaker and electronics for at least 4 years. Therefore, I went with the PS38. It seems Infinity took the hot rod approach to the PS38: rather than resort to tricks to reduce its size, they simply dropped the biggest speaker into the biggest enclosure for the price point and called it a day. Of course, that results in a large, heavy device that's difficult to hide, but it's an acceptable tradeoff unless you have a very finicky spouse. Fortunately, it looks good and professional. Your visitors *will* be impressed by the sound though. No one who has heard either of my PS* units has come away without commenting favorably on it. Like the PS28 before it, you'll go deaf or get evicted due to noise violations before you hit the PS38's performance limit when its used in an apartment living room. For music, the PS38 can easily fuel a block party, but that's a double edged sword as it can easily overwhelm dialogue and cause excessive late night noise when watching movies (but then again, no one buys subs for how quiet they are). If you want a capable sub on a budget, you can't go wrong with the PS38.

Infinity PS38

Great sub for my room (especially for the price), it really fills the room with deep rich bass. The PS38 is a great addition to my surround sound system (Paradigm speakers and Harmon/Kardon receiver.) In addition to the sub Crutchfield's customer service is excellent. I had originally purchased a PS28 but there was defect in it. I was able to talk to a person almost immediately to get my problem solved and Crutchfield sent out a replacement the next day. I can not recommend them high enough.

Superb Power in a Small Package

The PS38 is a terrific sub-woofer for the price, especially now that it is on sale for $199.99. It is a great addition to my Infinity Primus home theater speakers and there are many adjustments that can be made on the PS38 to hone in on the exact listening parameters set by the listener.

Great Sub !!!!!

Researched subwoofers from Klipsch, PolkAudio and Energy before deciding on this Infinity. 150 watts continous rms is plenty for me. Plus it matches my floors and center from infinity. It sounds great, plenty of bass, not a window rattler, but you can definitely feel the bass. I am very happy with the quality and price.

Great Sub

This sub definitively does the job. After owning a polk 110 I was not happy with the sound and then a polk 111 wich died within 2 weeks, I returned both of them. I get the ps38 and boy what a difference. Great sound and quality product for the price. 100% recommended.

Excellent

Hefty subwoofer -- adds richness to the two Infinity Primus P162, which themselves have pretty good range. Note that the subwoofer requires RCA audio plug cables NOT the banana plugs the Primus speakers use. And if your receiver has a dedicated single plug subwoofer output then you only need a single wire cable, not the two wire cable.

Just Right

Contacted Randy who was instrumental in helping me replace an expired item. This sub-woofer rocks for just the right price and is just what I needed. The house rumbles and makes you feel like you're there! Can't ask for anything more. Thanks so much!!!!